Consider an element z that has two naturally occurring, Chemistry

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Consider an element z that has two naturally occurring

Consider an element Z that has two naturally occurring isotopes with the folowing percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.05 abundant. What is the average atomic mass for element Z?

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Chemistry: Consider an element z that has two naturally occurring

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